.@{prefix}input_number {
    .btn {
        width: 20 * @unit;
        height: 20 * @unit;
        padding: 0;
        border: 0;
        vertical-align: middle;
        margin: 0 0.2rem;
    }
    input {
        background: #f6f6f6;
        height: 20 * @unit;
        width: 40 * @unit;
        text-align: center;
        border: 0;
        outline: none;
        font-size: 0.65rem;
    }
}